Dynamic modules.

The auto/module script is extended to understand ngx_module_link=DYNAMIC.
When set, it links the module as a shared object rather than statically
into nginx binary.  The module can later be loaded using the "load_module"
directive.

New auto/module parameter ngx_module_order allows to define module loading
order in complex cases.  By default the order is set based on ngx_module_type.

3rd party modules can be compiled dynamically using the --add-dynamic-module
configure option, which will preset ngx_module_link to "DYNAMIC" before
calling the module config script.

Win32 support is rudimentary, and only works when using MinGW gcc (which
is able to handle exports/imports automatically).

In collaboration with Ruslan Ermilov.

16 files changed, 483 insertions, 24 deletions

diff --git a/auto/cc/conf b/auto/cc/conf
index edc6d74dd..35fd39c5d 100644
--- a/auto/cc/conf
+++ b/auto/cc/conf
@@ -5,12 +5,17 @@
 
 LINK="\$(CC)"
 
+MAIN_LINK=
+MODULE_LINK="-shared"
+
 ngx_include_opt="-I "
 ngx_compile_opt="-c"
+ngx_pic_opt="-fPIC"
 ngx_objout="-o "
 ngx_binout="-o "
 ngx_objext="o"
 ngx_binext=
+ngx_modext=".so"
 
 ngx_long_start=
 ngx_long_end=
@@ -45,6 +50,9 @@ if test -n "$CFLAGS"; then
 
         sunc)
 
+            MAIN_LINK=
+            MODULE_LINK="-G"
+
             case "$NGX_MACHINE" in
 
                 i86pc)
@@ -156,6 +164,20 @@ if [ "$NGX_PLATFORM" != win32 ]; then
     fi
 
 
+    ngx_feature="-Wl,-E switch"
+    ngx_feature_name=
+    ngx_feature_run=no
+    ngx_feature_incs=
+    ngx_feature_path=
+    ngx_feature_libs=-Wl,-E
+    ngx_feature_test=
+    . auto/feature
+
+    if [ $ngx_found = yes ]; then
+        MAIN_LINK="-Wl,-E"
+    fi
+
+
     ngx_feature="gcc builtin atomic operations"
     ngx_feature_name=NGX_HAVE_GCC_ATOMIC
     ngx_feature_run=yes
diff --git a/auto/cc/msvc b/auto/cc/msvc
index 393ba3214..e588c487f 100644
--- a/auto/cc/msvc
+++ b/auto/cc/msvc
@@ -118,6 +118,12 @@ NGX_RCC="rc -fo$NGX_RES \$(CORE_INCS) $NGX_WIN32_RC"
 CORE_LINK="$NGX_RES $CORE_LINK"
 
 
+# dynamic modules
+#MAIN_LINK="-link -def:$NGX_OBJS/nginx.def"
+#MODULE_LINK="-LD $NGX_OBJS/nginx.lib"
+
+
+ngx_pic_opt=
 ngx_objout="-Fo"
 ngx_binout="-Fe"
 ngx_objext="obj"
diff --git a/auto/cc/sunc b/auto/cc/sunc
index 8f12d7cd7..8360c49c2 100644
--- a/auto/cc/sunc
+++ b/auto/cc/sunc
@@ -57,6 +57,9 @@ case "$NGX_MACHINE" in
 
 esac
 
+MAIN_LINK=
+MODULE_LINK="-G"
+
 
 # optimizations
 
diff --git a/auto/init b/auto/init
index 910f5294b..c593eda55 100644
--- a/auto/init
+++ b/auto/init
@@ -5,6 +5,7 @@
 
 NGX_MAKEFILE=$NGX_OBJS/Makefile
 NGX_MODULES_C=$NGX_OBJS/ngx_modules.c
+NGX_MODULES=
 
 NGX_AUTO_HEADERS_H=$NGX_OBJS/ngx_auto_headers.h
 NGX_AUTO_CONFIG_H=$NGX_OBJS/ngx_auto_config.h
diff --git a/auto/install b/auto/install
index f7f686c1a..4dcc743d3 100644
--- a/auto/install
+++ b/auto/install
@@ -26,6 +26,18 @@ case ".$NGX_SBIN_PATH" in
 esac
 
 
+case ".$NGX_MODULES_PATH" in
+    ./*)
+    ;;
+
+    *)
+        NGX_MODULES_PATH=$NGX_PREFIX/$NGX_MODULES_PATH
+    ;;
+esac
+
+NGX_MODULES_PATH=`dirname $NGX_MODULES_PATH/.`
+
+
 case ".$NGX_CONF_PATH" in
     ./*)
     ;;
@@ -158,12 +170,24 @@ END
 fi
 
 
+if test -n "$NGX_MODULES"; then
+    cat << END                                                >> $NGX_MAKEFILE
+
+	test -d '\$(DESTDIR)$NGX_MODULES_PATH' \
+		|| mkdir -p '\$(DESTDIR)$NGX_MODULES_PATH'
+	cp $NGX_MODULES '\$(DESTDIR)$NGX_MODULES_PATH'
+END
+
+fi
+
+
 # create Makefile
 
 cat << END >> Makefile
 
 build:
 	\$(MAKE) -f $NGX_MAKEFILE
+	\$(MAKE) -f $NGX_MAKEFILE modules
 	\$(MAKE) -f $NGX_MAKEFILE manpage
 
 install:
diff --git a/auto/lib/conf b/auto/lib/conf
index e1e447557..6aaa43a5f 100644
--- a/auto/lib/conf
+++ b/auto/lib/conf
@@ -58,11 +58,11 @@ if [ $USE_ZLIB = YES ]; then
     . auto/lib/zlib/conf
 fi
 
-if [ $USE_LIBXSLT = YES ]; then
+if [ $USE_LIBXSLT != NO ]; then
     . auto/lib/libxslt/conf
 fi
 
-if [ $USE_LIBGD = YES ]; then
+if [ $USE_LIBGD != NO ]; then
     . auto/lib/libgd/conf
 fi
 
@@ -70,7 +70,7 @@ if [ $USE_PERL = YES ]; then
     . auto/lib/perl/conf
 fi
 
-if [ $HTTP_GEOIP = YES ]; then
+if [ $USE_GEOIP != NO ]; then
     . auto/lib/geoip/conf
 fi
 
diff --git a/auto/lib/geoip/conf b/auto/lib/geoip/conf
index 53c274d54..ebd2e15cc 100644
--- a/auto/lib/geoip/conf
+++ b/auto/lib/geoip/conf
@@ -67,7 +67,12 @@ fi
 if [ $ngx_found = yes ]; then
 
     CORE_INCS="$CORE_INCS $ngx_feature_path"
-    CORE_LIBS="$CORE_LIBS $ngx_feature_libs"
+
+    if [ $USE_GEOIP = YES ]; then
+        CORE_LIBS="$CORE_LIBS $ngx_feature_libs"
+    fi
+
+    NGX_LIB_GEOIP=$ngx_feature_libs
 
     if [ $NGX_IPV6 = YES ]; then
         ngx_feature="GeoIP IPv6 support"
diff --git a/auto/lib/libgd/conf b/auto/lib/libgd/conf
index ff99054db..6e4e91cf0 100644
--- a/auto/lib/libgd/conf
+++ b/auto/lib/libgd/conf
@@ -67,7 +67,12 @@ fi
 if [ $ngx_found = yes ]; then
 
     CORE_INCS="$CORE_INCS $ngx_feature_path"
-    CORE_LIBS="$CORE_LIBS $ngx_feature_libs"
+
+    if [ $USE_LIBGD = YES ]; then
+        CORE_LIBS="$CORE_LIBS $ngx_feature_libs"
+    fi
+
+    NGX_LIB_LIBGD=$ngx_feature_libs
 
 else
 
diff --git a/auto/lib/libxslt/conf b/auto/lib/libxslt/conf
index bc19d83dd..3a0f37be5 100644
--- a/auto/lib/libxslt/conf
+++ b/auto/lib/libxslt/conf
@@ -76,7 +76,12 @@ fi
 if [ $ngx_found = yes ]; then
 
     CORE_INCS="$CORE_INCS $ngx_feature_path"
-    CORE_LIBS="$CORE_LIBS $ngx_feature_libs"
+
+    if [ $USE_LIBXSLT = YES ]; then
+        CORE_LIBS="$CORE_LIBS $ngx_feature_libs"
+    fi
+
+    NGX_LIB_LIBXSLT=$ngx_feature_libs
 
 else
 
@@ -152,5 +157,9 @@ fi
 
 
 if [ $ngx_found = yes ]; then
-    CORE_LIBS="$CORE_LIBS -lexslt"
+    if [ $USE_LIBXSLT = YES ]; then
+        CORE_LIBS="$CORE_LIBS -lexslt"
+    fi
+
+    NGX_LIB_LIBXSLT="$NGX_LIB_LIBXSLT -lexslt"
 fi
diff --git a/auto/make b/auto/make
index 76b580684..039a70f18 100644
--- a/auto/make
+++ b/auto/make
@@ -98,9 +98,11 @@ fi
 
 # the mail dependencies and include paths
 
-if [ $MAIL = YES ]; then
+if [ $MAIL != NO ]; then
 
-    ngx_all_srcs="$ngx_all_srcs $MAIL_SRCS"
+    if [ $MAIL = YES ]; then
+        ngx_all_srcs="$ngx_all_srcs $MAIL_SRCS"
+    fi
 
     ngx_deps=`echo $MAIL_DEPS \
         | sed -e "s/  *\([^ ][^ ]*\)/$ngx_regex_cont\1/g" \
@@ -124,9 +126,11 @@ fi
 
 # the stream dependencies and include paths
 
-if [ $STREAM = YES ]; then
+if [ $STREAM != NO ]; then
 
-    ngx_all_srcs="$ngx_all_srcs $STREAM_SRCS"
+    if [ $STREAM = YES ]; then
+        ngx_all_srcs="$ngx_all_srcs $STREAM_SRCS"
+    fi
 
     ngx_deps=`echo $STREAM_DEPS \
         | sed -e "s/  *\([^ ][^ ]*\)/$ngx_regex_cont\1/g" \
@@ -204,6 +208,7 @@ ngx_objs=`echo $ngx_all_objs $ngx_modules_obj \
     | sed -e "s/  *\([^ ][^ ]*\)/$ngx_long_regex_cont\1/g" \
           -e "s/\//$ngx_regex_dirsep/g"`
 
+ngx_libs=
 if test -n "$NGX_LD_OPT$CORE_LIBS"; then
     ngx_libs=`echo $NGX_LD_OPT $CORE_LIBS \
         | sed -e "s/\//$ngx_regex_dirsep/g" -e "s/^/$ngx_long_regex_cont/"`
@@ -212,13 +217,18 @@ fi
 ngx_link=${CORE_LINK:+`echo $CORE_LINK \
     | sed -e "s/\//$ngx_regex_dirsep/g" -e "s/^/$ngx_long_regex_cont/"`}
 
+ngx_main_link=${MAIN_LINK:+`echo $MAIN_LINK \
+    | sed -e "s/\//$ngx_regex_dirsep/g" -e "s/^/$ngx_long_regex_cont/"`}
+
 
 cat << END                                                    >> $NGX_MAKEFILE
 
 $NGX_OBJS${ngx_dirsep}nginx${ngx_binext}:	$ngx_deps$ngx_spacer
-	\$(LINK) ${ngx_long_start}${ngx_binout}$NGX_OBJS${ngx_dirsep}nginx$ngx_long_cont$ngx_objs$ngx_libs$ngx_link
+	\$(LINK) ${ngx_long_start}${ngx_binout}$NGX_OBJS${ngx_dirsep}nginx$ngx_long_cont$ngx_objs$ngx_libs$ngx_link$ngx_main_link
 	$ngx_rcc
 ${ngx_long_end}
+
+modules:
 END
 
 
@@ -472,3 +482,186 @@ $ngx_pch
 END
 
 fi
+
+
+# dynamic modules
+
+if test -n "$NGX_PCH"; then
+    ngx_cc="\$(CC) $ngx_compile_opt $ngx_pic_opt \$(CFLAGS) $ngx_use_pch \$(ALL_INCS)"
+else
+    ngx_cc="\$(CC) $ngx_compile_opt $ngx_pic_opt \$(CFLAGS) \$(ALL_INCS)"
+fi
+
+ngx_obj_deps="\$(CORE_DEPS)"
+if [ $HTTP != NO ]; then
+    ngx_obj_deps="$ngx_obj_deps \$(HTTP_DEPS)"
+fi
+if [ $MAIL != NO ]; then
+    ngx_obj_deps="$ngx_obj_deps \$(MAIL_DEPS)"
+fi
+if [ $STREAM != NO ]; then
+    ngx_obj_deps="$ngx_obj_deps \$(STREAM_DEPS)"
+fi
+
+for ngx_module in $DYNAMIC_MODULES
+do
+    eval ngx_module_srcs="\$${ngx_module}_SRCS"
+    eval eval ngx_module_libs="\\\"\$${ngx_module}_LIBS\\\""
+
+    eval ngx_module_modules="\$${ngx_module}_MODULES"
+    eval ngx_module_order="\$${ngx_module}_ORDER"
+
+    ngx_modules_c=$NGX_OBJS/${ngx_module}_modules.c
+
+    cat << END                                    > $ngx_modules_c
+
+#include <ngx_config.h>
+#include <ngx_core.h>
+
+END
+
+    for mod in $ngx_module_modules
+    do
+        echo "extern ngx_module_t  $mod;"         >> $ngx_modules_c
+    done
+
+    echo                                          >> $ngx_modules_c
+    echo 'ngx_module_t *ngx_modules[] = {'        >> $ngx_modules_c
+
+    for mod in $ngx_module_modules
+    do
+        echo "    &$mod,"                         >> $ngx_modules_c
+    done
+
+    cat << END                                    >> $ngx_modules_c
+    NULL
+};
+
+END
+
+    echo 'char *ngx_module_names[] = {'           >> $ngx_modules_c
+
+    for mod in $ngx_module_modules
+    do
+        echo "    \"$mod\","                      >> $ngx_modules_c
+    done
+
+    cat << END                                    >> $ngx_modules_c
+    NULL
+};
+
+END
+
+    echo 'char *ngx_module_order[] = {'           >> $ngx_modules_c
+
+    for mod in $ngx_module_order
+    do
+        echo "    \"$mod\","                      >> $ngx_modules_c
+    done
+
+    cat << END                                    >> $ngx_modules_c
+    NULL
+};
+
+END
+
+    ngx_modules_c=`echo $ngx_modules_c | sed -e "s/\//$ngx_regex_dirsep/g"`
+
+    ngx_modules_obj=`echo $ngx_modules_c \
+        | sed -e "s/\(.*\.\)c/\1$ngx_objext/"`
+
+    ngx_module_objs=
+    for ngx_src in $ngx_module_srcs
+    do
+        case "$ngx_src" in
+            src/*)
+                ngx_obj=$ngx_src
+                ;;
+            *)
+                ngx_obj="addon/`basename \`dirname $ngx_src\``"
+                mkdir -p $NGX_OBJS/$ngx_obj
+                ngx_obj="$ngx_obj/`basename $ngx_src`"
+                ;;
+        esac
+
+        ngx_module_objs="$ngx_module_objs $ngx_obj"
+    done
+
+    ngx_module_objs=`echo $ngx_module_objs \
+        | sed -e "s#\([^ ]*\.\)cpp#$NGX_OBJS\/\1$ngx_objext#g" \
+              -e "s#\([^ ]*\.\)cc#$NGX_OBJS\/\1$ngx_objext#g" \
+              -e "s#\([^ ]*\.\)c#$NGX_OBJS\/\1$ngx_objext#g" \
+              -e "s#\([^ ]*\.\)S#$NGX_OBJS\/\1$ngx_objext#g"`
+
+    ngx_deps=`echo $ngx_module_objs $ngx_modules_obj $LINK_DEPS \
+        | sed -e "s/  *\([^ ][^ ]*\)/$ngx_regex_cont\1/g" \
+              -e "s/\//$ngx_regex_dirsep/g"`
+
+    ngx_objs=`echo $ngx_module_objs $ngx_modules_obj \
+        | sed -e "s/  *\([^ ][^ ]*\)/$ngx_long_regex_cont\1/g" \
+              -e "s/\//$ngx_regex_dirsep/g"`
+
+    ngx_obj=$NGX_OBJS${ngx_dirsep}${ngx_module}${ngx_modext}
+
+    NGX_MODULES="$NGX_MODULES $ngx_obj"
+
+    if [ "$NGX_PLATFORM" = win32 ]; then
+        ngx_module_libs="$CORE_LIBS $ngx_module_libs"
+    fi
+
+    ngx_libs=
+    if test -n "$NGX_LD_OPT$ngx_module_libs"; then
+        ngx_libs=`echo $NGX_LD_OPT $ngx_module_libs \
+            | sed -e "s/\//$ngx_regex_dirsep/g" -e "s/^/$ngx_long_regex_cont/"`
+    fi
+
+    ngx_link=${CORE_LINK:+`echo $CORE_LINK \
+        | sed -e "s/\//$ngx_regex_dirsep/g" -e "s/^/$ngx_long_regex_cont/"`}
+
+    ngx_module_link=${MODULE_LINK:+`echo $MODULE_LINK \
+        | sed -e "s/\//$ngx_regex_dirsep/g" -e "s/^/$ngx_long_regex_cont/"`}
+
+
+    cat << END                                            >> $NGX_MAKEFILE
+
+modules:	$ngx_obj
+
+$ngx_obj:	$ngx_deps$ngx_spacer
+	\$(LINK) $ngx_long_start$ngx_binout$ngx_obj$ngx_long_cont$ngx_objs$ngx_libs$ngx_link$ngx_module_link
+$ngx_long_end
+
+$ngx_modules_obj:	\$(CORE_DEPS)$ngx_cont$ngx_modules_c
+	$ngx_cc$ngx_tab$ngx_objout$ngx_modules_obj$ngx_tab$ngx_modules_c$NGX_AUX
+
+END
+
+    for ngx_src in $ngx_module_srcs
+    do
+        case "$ngx_src" in
+            src/*)
+                ngx_obj=`echo $ngx_src | sed -e "s/\//$ngx_regex_dirsep/g"`
+                ;;
+            *)
+                ngx_obj="addon/`basename \`dirname $ngx_src\``"
+                ngx_obj=`echo $ngx_obj/\`basename $ngx_src\` \
+                    | sed -e "s/\//$ngx_regex_dirsep/g"`
+                ;;
+        esac
+
+        ngx_obj=`echo $ngx_obj \
+            | sed -e "s#^\(.*\.\)cpp\\$#$ngx_objs_dir\1$ngx_objext#g" \
+                  -e "s#^\(.*\.\)cc\\$#$ngx_objs_dir\1$ngx_objext#g" \
+                  -e "s#^\(.*\.\)c\\$#$ngx_objs_dir\1$ngx_objext#g" \
+                  -e "s#^\(.*\.\)S\\$#$ngx_objs_dir\1$ngx_objext#g"`
+
+        ngx_src=`echo $ngx_src | sed -e "s/\//$ngx_regex_dirsep/g"`
+
+        cat << END                                        >> $NGX_MAKEFILE
+
+$ngx_obj:	$ngx_obj_deps$ngx_cont$ngx_src
+	$ngx_cc$ngx_tab$ngx_objout$ngx_obj$ngx_tab$ngx_src$NGX_AUX
+
+END
+
+    done
+done
diff --git a/auto/module b/auto/module
index 33ee18126..908f0c6e6 100644
--- a/auto/module
+++ b/auto/module
@@ -9,7 +9,58 @@ case $ngx_module_type in
 esac
 
 
-if [ "$ngx_module_link" = YES ]; then
+if [ "$ngx_module_link" = DYNAMIC ]; then
+
+    for ngx_module in $ngx_module_name; do
+        # extract the first name
+        break
+    done
+
+    DYNAMIC_MODULES="$DYNAMIC_MODULES $ngx_module"
+    eval ${ngx_module}_SRCS=\"$ngx_module_srcs\"
+
+    eval ${ngx_module}_MODULES=\"$ngx_module_name\"
+
+    if [ -z "$ngx_module_order" -a \
+         \( "$ngx_module_type" = "HTTP_FILTER" \
+         -o "$ngx_module_type" = "HTTP_AUX_FILTER" \) ]
+    then
+        eval ${ngx_module}_ORDER=\"$ngx_module_name \
+                                   ngx_http_copy_filter_module\"
+    else
+        eval ${ngx_module}_ORDER=\"$ngx_module_order\"
+    fi
+
+    if test -n "$ngx_module_incs"; then
+        CORE_INCS="$CORE_INCS $ngx_module_incs"
+    fi
+
+    libs=
+    for lib in $ngx_module_libs
+    do
+        case $lib in
+
+            LIBXSLT | LIBGD | GEOIP)
+                libs="$libs \$NGX_LIB_$lib"
+
+                if eval [ "\$USE_${lib}" = NO ] ; then
+                    eval USE_${lib}=DYNAMIC
+                fi
+            ;;
+
+            PCRE | OPENSSL | MD5 | SHA1 | ZLIB | PERL)
+                eval USE_${lib}=YES
+            ;;
+
+            *)
+                libs="$libs $lib"
+            ;;
+
+        esac
+    done
+    eval ${ngx_module}_LIBS=\'$libs\'
+
+elif [ "$ngx_module_link" = YES ]; then
 
     eval ${ngx_module_type}_MODULES=\"\$${ngx_module_type}_MODULES \
                                       $ngx_module_name\"
diff --git a/auto/modules b/auto/modules
index 8256b658e..b68a96fbe 100644
--- a/auto/modules
+++ b/auto/modules
@@ -159,6 +159,35 @@ fi
 ngx_module_type=HTTP_FILTER
 HTTP_FILTER_MODULES=
 
+ngx_module_order="ngx_http_static_module \
+                  ngx_http_gzip_static_module \
+                  ngx_http_dav_module \
+                  ngx_http_autoindex_module \
+                  ngx_http_index_module \
+                  ngx_http_random_index_module \
+                  ngx_http_access_module \
+                  ngx_http_realip_module \
+                  ngx_http_write_filter_module \
+                  ngx_http_header_filter_module \
+                  ngx_http_chunked_filter_module \
+                  ngx_http_v2_filter_module \
+                  ngx_http_range_header_filter_module \
+                  ngx_http_gzip_filter_module \
+                  ngx_http_postpone_filter_module \
+                  ngx_http_ssi_filter_module \
+                  ngx_http_charset_filter_module \
+                  ngx_http_xslt_filter_module \
+                  ngx_http_image_filter_module \
+                  ngx_http_sub_filter_module \
+                  ngx_http_addition_filter_module \
+                  ngx_http_gunzip_filter_module \
+                  ngx_http_userid_filter_module \
+                  ngx_http_headers_filter_module \
+                  ngx_http_copy_filter_module \
+                  ngx_http_range_body_filter_module \
+                  ngx_http_not_modified_filter_module \
+                  ngx_http_slice_filter_module"
+
 if :; then
     ngx_module_name=ngx_http_write_filter_module
     ngx_module_incs=
@@ -263,7 +292,7 @@ if [ $HTTP_CHARSET = YES ]; then
     . auto/module
 fi
 
-if [ $HTTP_XSLT = YES ]; then
+if [ $HTTP_XSLT != NO ]; then
     ngx_module_name=ngx_http_xslt_filter_module
     ngx_module_incs=
     ngx_module_deps=
@@ -274,7 +303,7 @@ if [ $HTTP_XSLT = YES ]; then
     . auto/module
 fi
 
-if [ $HTTP_IMAGE_FILTER = YES ]; then
+if [ $HTTP_IMAGE_FILTER != NO ]; then
     ngx_module_name=ngx_http_image_filter_module
     ngx_module_incs=
     ngx_module_deps=
@@ -579,14 +608,14 @@ if [ $HTTP_GEO = YES ]; then
     . auto/module
 fi
 
-if [ $HTTP_GEOIP = YES ]; then
+if [ $HTTP_GEOIP != NO ]; then
     have=NGX_HTTP_X_FORWARDED_FOR . auto/have
 
     ngx_module_name=ngx_http_geoip_module
     ngx_module_incs=
     ngx_module_deps=
     ngx_module_srcs=src/http/modules/ngx_http_geoip_module.c
-    ngx_module_libs=
+    ngx_module_libs=GEOIP
     ngx_module_link=$HTTP_GEOIP
 
     . auto/module
@@ -864,7 +893,7 @@ if [ $HTTP_STUB_STATUS = YES ]; then
 fi
 
 
-if [ $MAIL == YES ]; then
+if [ $MAIL != NO ]; then
     MAIL_MODULES=
     MAIL_DEPS=
     MAIL_INCS=
@@ -873,6 +902,8 @@ if [ $MAIL == YES ]; then
     ngx_module_libs=
     ngx_module_link=YES
 
+    ngx_module_order=
+
     ngx_module_name="ngx_mail_module ngx_mail_core_module"
     ngx_module_incs="src/mail"
     ngx_module_deps="src/mail/ngx_mail.h"
@@ -937,7 +968,7 @@ if [ $MAIL == YES ]; then
 fi
 
 
-if [ $STREAM = YES ]; then
+if [ $STREAM != NO ]; then
     STREAM_MODULES=
     STREAM_DEPS=
     STREAM_INCS=
@@ -948,6 +979,8 @@ if [ $STREAM = YES ]; then
     ngx_module_libs=
     ngx_module_link=YES
 
+    ngx_module_order=
+
     ngx_module_name="ngx_stream_module \
                      ngx_stream_core_module \
                      ngx_stream_proxy_module \
@@ -1041,6 +1074,7 @@ if test -n "$NGX_ADDONS"; then
         ngx_module_deps=
         ngx_module_srcs=
         ngx_module_libs=
+        ngx_module_order=
         ngx_module_link=ADDON
 
         if test -f $ngx_addon_dir/config; then
@@ -1056,6 +1090,36 @@ if test -n "$NGX_ADDONS"; then
 fi
 
 
+if test -n "$DYNAMIC_ADDONS"; then
+
+    echo configuring additional dynamic modules
+
+    for ngx_addon_dir in $DYNAMIC_ADDONS
+    do
+        echo "adding module in $ngx_addon_dir"
+
+        ngx_module_type=
+        ngx_module_name=
+        ngx_module_incs=
+        ngx_module_deps=
+        ngx_module_srcs=
+        ngx_module_libs=
+        ngx_module_order=
+        ngx_module_link=DYNAMIC
+
+        if test -f $ngx_addon_dir/config; then
+            . $ngx_addon_dir/config
+
+            echo " + $ngx_addon_name was configured"
+
+        else
+            echo "$0: error: no $ngx_addon_dir/config was found"
+            exit 1
+        fi
+    done
+fi
+
+
 if [ $USE_OPENSSL = YES ]; then
     ngx_module_type=CORE
     ngx_module_name=ngx_openssl_module
@@ -1065,6 +1129,7 @@ if [ $USE_OPENSSL = YES ]; then
                      src/event/ngx_event_openssl_stapling.c"
     ngx_module_libs=
     ngx_module_link=YES
+    ngx_module_order=
 
     . auto/module
 fi
@@ -1078,6 +1143,7 @@ if [ $USE_PCRE = YES ]; then
     ngx_module_srcs=src/core/ngx_regex.c
     ngx_module_libs=
     ngx_module_link=YES
+    ngx_module_order=
 
     . auto/module
 fi
@@ -1100,14 +1166,42 @@ if [ $HTTP = YES ]; then
 fi
 
 
-if [ $MAIL = YES ]; then
-    modules="$modules $MAIL_MODULES"
+if [ $MAIL != NO ]; then
+
+    if [ $MAIL = YES ]; then
+        modules="$modules $MAIL_MODULES"
+
+    elif [ $MAIL = DYNAMIC ]; then
+        ngx_module_name=$MAIL_MODULES
+        ngx_module_incs=
+        ngx_module_deps=$MAIL_DEPS
+        ngx_module_srcs=$MAIL_SRCS
+        ngx_module_libs=
+        ngx_module_link=DYNAMIC
+
+        . auto/module
+    fi
+
     NGX_ADDON_DEPS="$NGX_ADDON_DEPS \$(MAIL_DEPS)"
 fi
 
 
-if [ $STREAM = YES ]; then
-    modules="$modules $STREAM_MODULES"
+if [ $STREAM != NO ]; then
+
+    if [ $STREAM = YES ]; then
+        modules="$modules $STREAM_MODULES"
+
+    elif [ $STREAM = DYNAMIC ]; then
+        ngx_module_name=$STREAM_MODULES
+        ngx_module_incs=
+        ngx_module_deps=$STREAM_DEPS
+        ngx_module_srcs=$STREAM_SRCS
+        ngx_module_libs=
+        ngx_module_link=DYNAMIC
+
+        . auto/module
+    fi
+
     NGX_ADDON_DEPS="$NGX_ADDON_DEPS \$(STREAM_DEPS)"
 fi
 
@@ -1167,3 +1261,16 @@ cat << END                                    >> $NGX_MODULES_C
 };
 
 END
+
+echo 'char *ngx_module_names[] = {'           >> $NGX_MODULES_C
+
+for mod in $modules
+do
+    echo "    \"$mod\","                      >> $NGX_MODULES_C
+done
+
+cat << END                                    >> $NGX_MODULES_C
+    NULL
+};
+
+END
diff --git a/auto/options b/auto/options
index 931dabb05..36b34bc31 100644
--- a/auto/options
+++ b/auto/options
@@ -7,6 +7,7 @@ help=no
 
 NGX_PREFIX=
 NGX_SBIN_PATH=
+NGX_MODULES_PATH=
 NGX_CONF_PREFIX=
 NGX_CONF_PATH=
 NGX_ERROR_LOG_PATH=
@@ -120,7 +121,11 @@ STREAM_UPSTREAM_HASH=YES
 STREAM_UPSTREAM_LEAST_CONN=YES
 STREAM_UPSTREAM_ZONE=YES
 
+DYNAMIC_MODULES=
+
 NGX_ADDONS=
+NGX_ADDON_DEPS=
+DYNAMIC_ADDONS=
 
 USE_PCRE=NO
 PCRE=NONE
@@ -151,6 +156,7 @@ NGX_PERL=perl
 
 USE_LIBXSLT=NO
 USE_LIBGD=NO
+USE_GEOIP=NO
 
 NGX_GOOGLE_PERFTOOLS=NO
 NGX_CPP_TEST=NO
@@ -178,6 +184,7 @@ do
         --prefix=)                       NGX_PREFIX="!"             ;;
         --prefix=*)                      NGX_PREFIX="$value"        ;;
         --sbin-path=*)                   NGX_SBIN_PATH="$value"     ;;
+        --modules-path=*)                NGX_MODULES_PATH="$value"  ;;
         --conf-path=*)                   NGX_CONF_PATH="$value"     ;;
         --error-log-path=*)              NGX_ERROR_LOG_PATH="$value";;
         --pid-path=*)                    NGX_PID_PATH="$value"      ;;
@@ -215,8 +222,13 @@ do
         --with-http_realip_module)       HTTP_REALIP=YES            ;;
         --with-http_addition_module)     HTTP_ADDITION=YES          ;;
         --with-http_xslt_module)         HTTP_XSLT=YES              ;;
+        --with-http_xslt_module=dynamic) HTTP_XSLT=DYNAMIC          ;;
         --with-http_image_filter_module) HTTP_IMAGE_FILTER=YES      ;;
+        --with-http_image_filter_module=dynamic)
+                                         HTTP_IMAGE_FILTER=DYNAMIC  ;;
         --with-http_geoip_module)        HTTP_GEOIP=YES             ;;
+        --with-http_geoip_module=dynamic)
+                                         HTTP_GEOIP=DYNAMIC         ;;
         --with-http_sub_module)          HTTP_SUB=YES               ;;
         --with-http_dav_module)          HTTP_DAV=YES               ;;
         --with-http_flv_module)          HTTP_FLV=YES               ;;
@@ -266,6 +278,7 @@ do
         --with-http_stub_status_module)  HTTP_STUB_STATUS=YES       ;;
 
         --with-mail)                     MAIL=YES                   ;;
+        --with-mail=dynamic)             MAIL=DYNAMIC               ;;
         --with-mail_ssl_module)          MAIL_SSL=YES               ;;
         # STUB
         --with-imap)
@@ -285,6 +298,7 @@ use the \"--with-mail_ssl_module\" option instead"
         --without-mail_smtp_module)      MAIL_SMTP=NO               ;;
 
         --with-stream)                   STREAM=YES                 ;;
+        --with-stream=dynamic)           STREAM=DYNAMIC             ;;
         --with-stream_ssl_module)        STREAM_SSL=YES             ;;
         --without-stream_limit_conn_module)
                                          STREAM_LIMIT_CONN=NO       ;;
@@ -300,6 +314,7 @@ use the \"--with-mail_ssl_module\" option instead"
         --with-cpp_test_module)          NGX_CPP_TEST=YES           ;;
 
         --add-module=*)                  NGX_ADDONS="$NGX_ADDONS $value" ;;
+        --add-dynamic-module=*)          DYNAMIC_ADDONS="$DYNAMIC_ADDONS $value" ;;
 
         --with-cc=*)                     CC="$value"                ;;
         --with-cpp=*)                    CPP="$value"               ;;
@@ -356,6 +371,7 @@ cat << END
 
   --prefix=PATH                      set installation prefix
   --sbin-path=PATH                   set nginx binary pathname
+  --modules-path=PATH                set modules path
   --conf-path=PATH                   set nginx.conf pathname
   --error-log-path=PATH              set error log pathname
   --pid-path=PATH                    set nginx.pid pathname
@@ -384,8 +400,12 @@ cat << END
   --with-http_realip_module          enable ngx_http_realip_module
   --with-http_addition_module        enable ngx_http_addition_module
   --with-http_xslt_module            enable ngx_http_xslt_module
+  --with-http_xslt_module=dynamic    enable dynamic ngx_http_xslt_module
   --with-http_image_filter_module    enable ngx_http_image_filter_module
+  --with-http_image_filter_module=dynamic
+                                     enable dynamic ngx_http_image_filter_module
   --with-http_geoip_module           enable ngx_http_geoip_module
+  --with-http_geoip_module=dynamic   enable dynamic ngx_http_geoip_module
   --with-http_sub_module             enable ngx_http_sub_module
   --with-http_dav_module             enable ngx_http_dav_module
   --with-http_flv_module             enable ngx_http_flv_module
@@ -451,12 +471,14 @@ cat << END
   --without-http-cache               disable HTTP cache
 
   --with-mail                        enable POP3/IMAP4/SMTP proxy module
+  --with-mail=dynamic                enable dynamic POP3/IMAP4/SMTP proxy module
   --with-mail_ssl_module             enable ngx_mail_ssl_module
   --without-mail_pop3_module         disable ngx_mail_pop3_module
   --without-mail_imap_module         disable ngx_mail_imap_module
   --without-mail_smtp_module         disable ngx_mail_smtp_module
 
   --with-stream                      enable TCP proxy module
+  --with-stream=dynamic              enable dynamic TCP proxy module
   --with-stream_ssl_module           enable ngx_stream_ssl_module
   --without-stream_limit_conn_module disable ngx_stream_limit_conn_module
   --without-stream_access_module     disable ngx_stream_access_module
@@ -470,7 +492,8 @@ cat << END
   --with-google_perftools_module     enable ngx_google_perftools_module
   --with-cpp_test_module             enable ngx_cpp_test_module
 
-  --add-module=PATH                  enable an external module
+  --add-module=PATH                  enable external module
+  --add-dynamic-module=PATH          enable dynamic external module
 
   --with-cc=PATH                     set C compiler pathname
   --with-cpp=PATH                    set C preprocessor pathname
@@ -533,6 +556,7 @@ fi
 
 
 NGX_SBIN_PATH=${NGX_SBIN_PATH:-sbin/nginx}
+NGX_MODULES_PATH=${NGX_MODULES_PATH:-modules}
 NGX_CONF_PATH=${NGX_CONF_PATH:-conf/nginx.conf}
 NGX_CONF_PREFIX=`dirname $NGX_CONF_PATH`
 NGX_PID_PATH=${NGX_PID_PATH:-logs/nginx.pid}
diff --git a/auto/os/darwin b/auto/os/darwin
index 1d3e3d393..9b31b1f69 100644
--- a/auto/os/darwin
+++ b/auto/os/darwin
@@ -14,6 +14,9 @@ CORE_SRCS="$UNIX_SRCS $DARWIN_SRCS"
 ngx_spacer='
 '
 
+MAIN_LINK=
+MODULE_LINK="-shared -Wl,-undefined,dynamic_lookup"
+
 # kqueue
 
 echo " + kqueue found"
diff --git a/auto/os/win32 b/auto/os/win32
index 82fc212f8..14ae3b863 100644
--- a/auto/os/win32
+++ b/auto/os/win32
@@ -12,10 +12,15 @@ OS_CONFIG="$WIN32_CONFIG"
 NGX_ICONS="$NGX_WIN32_ICONS"
 SELECT_SRCS=$WIN32_SELECT_SRCS
 
+ngx_pic_opt=
+
 case "$NGX_CC_NAME" in
 
     gcc)
         CORE_LIBS="$CORE_LIBS -ladvapi32 -lws2_32"
+        MAIN_LINK="$MAIN_LINK -Wl,--export-all-symbols"
+        MAIN_LINK="$MAIN_LINK -Wl,--out-implib=$NGX_OBJS/libnginx.a"
+        MODULE_LINK="-shared -L $NGX_OBJS -lnginx"
     ;;
 
     *)
diff --git a/auto/summary b/auto/summary
index 1be975d82..dc8fe4f05 100644
--- a/auto/summary
+++ b/auto/summary
@@ -60,6 +60,7 @@ echo
 cat << END
   nginx path prefix: "$NGX_PREFIX"
   nginx binary file: "$NGX_SBIN_PATH"
+  nginx modules path: "$NGX_MODULES_PATH"
   nginx configuration prefix: "$NGX_CONF_PREFIX"
   nginx configuration file: "$NGX_CONF_PATH"
   nginx pid file: "$NGX_PID_PATH"